5.1.5 配置root用户SSH免密码登录

5.1.5　配置root用户SSH免密码登录

在后续的实战案例章节中需要搭建MySQL集群环境，为了避免登录每台服务器的烦琐操作，这里配置服务器的SSH免密码登录。后续只登录其中一台服务器，再通过SSH免密码登录到其他服务器即可。

在单台服务器上配置SSH免密码登录的过程比较简单，只需要在服务器的命令行中依次输入如下命令即可。

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ssh-keygen -t rsa
cp ~/.ssh/id_rsa.pub ~/.ssh/authorized_keys

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在服务器的命令行中输入上述命令的具体执行过程如下：

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[root@binghe150 ~]# ssh-keygen -t rsa
Generating public/private rsa key pair.
Enter file in which to save the key (/root/.ssh/id_rsa): 
Created directory '/root/.ssh'.
Enter passphrase (empty for no passphrase): 
Enter same passphrase again: 
Your identification has been saved in /root/.ssh/id_rsa.
Your public key has been saved in /root/.ssh/id_rsa.pub.
The key fingerprint is:
8f:29:0a:db:e2:48:74:4f:1a:87:17:98:e7:dd:01:15 root@binghe150
The key's randomart image is:
+--[ RSA 2048]----+
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